I've searched around a bit and my question seems a bit more specific than my searching skills yield. Long story short I'm building a pair of fonken floorstander MKII's for a good friend. I'm wanting to streamline the build and make the finishing process much less time consuming, but not sacrifice long term durabilty.

Is it generally considered structurally acceptable to use just butt joints (no dado, dowels, biscuits, etc.), pva glue, and obviously sufficient clamping when assembling a speaker cabinet of suitable engineered materials (ply, mdf, etc.)? I'm really trying to avoid using screws, and adversely having to fill and sand holes to the tune of 50 per cab. Thoughts? Any advice/input appreciated.

I've made many cabs like this, you just need to make sure you have enough clamps!

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Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?

Apart from the first couple of boxes I built I've always just used butt joints and glue (first PVA now always Cascamite) and never had a problem. Adding a rebate makes it a lot easier to keep the panels aligned though.

I like dowels, with the right jig it makes assembly a lot easier. I aso use polyurethene glue, it will fill any gaps, so guaranteeing a good air tight seal.
But using butt joints only can be done, I find it awkward if glueing large things, which is why I ended up bying a couple of doweling jigs. Tried biscuits, but found dowels more accurate.

To stop stuff sliding around on a film of glue whilst clamping, just sprinkle a tiny bit of sand on the joints, it'll cut through the glue, yet compress into the wood and not hold it apart. Oh and I'm not saying there aren't many ways of building cabs, I have dado blades for the tablesaw, biscuit and dowel cutters, as well as my favourite, the air nailer, but glue and clamps does work.

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Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?